Hugh Hefner's ex wife Kimberly Conrad is suing the porn mogul after he reportedly went back on their pre-nuptial agreement.

The former Playboy Playmate married Hefner in 1989 and share two sons, Marston and Cooper. The pair split in 1998 but never divorced, with the relationship staying amicable and Conrad residing near Hefner's Playboy Mansion in Beverly Hills.

However, Hefner has reportedly gone against their amended pre-nup deal by trying to sell Conrad's home, and giving her nine months to move out.

According to TMZ.com, Conrad filed a suit against her ex at L.A. Superior Court after Hefner decided he would not honor their initial agreement anymore - and also claims he owes her more than $5 million.

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(This news article provided by World Entertainment News Network)